parse_number
t2 = parse_number(t1, last);
t2 = parse_number(t1, last);
const char *t = parse_number(first, last);
t1 = parse_number(t, last);
t1 = parse_number(t, last);
t1 = parse_number(t, last);
t = parse_number(first + 1, last);
t1 = parse_number(t, last);
t1 = parse_number(t + 1, last);
static const char *parse_number(const char *, const char *);